Coating machine



Patented F eb. 8, 1,927.

TED .s i

HERMAN G. WEBER, OF APPLETON, WISCONSIN, ASSIGNOR F ONE-HALF TO AMERI-CAN LAKES PAPER COMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION OF DELA-WARE.

COATING MACHINE.

Application led February 2, 1925. Serial No. 6,165.

This invention relates to coating machines but more particularly to suchas are adapted for applying paste or gum to paper bags, envelopes, andthe like, and has for its pri- 5. mary object to provide a more uniformapplication of the coatin material. Further important objects of myinvention are to prevent'dry spaces on the feed roller produced by thepresence of foreign material or lumps in the vicinity of this roller, toagitate the coating material, to save labor, and in general, to providea simplified and improved -4 coating mechanism.

The particular embodiment of my invention which I have selectedl toillustrate the principles thereof forms a part of the gump mingmechanism of a paperjbag machine, but it will be readily evident thatthe novel elements of this device are equally applicable to any type ofcoating mechanism.

. Referring to the drawing, I

Fig. 1 is aicentral, vertical section of lthe coating mechanism, and

Fig. 2 1s atransverse, vertical section on.

the line 2-2 of Fig. 1.

` In the drawings, the supply of coating material is held in a suitablereceptacle as 5, and this material is removed therefrom by a feed rolleras 6, which in the present embodimentV directly applies this material toa gumming die as 7 The roller is preferably mounted in eccentricbearings as 8, which enable the position of this roller to be adjustedto pro/vide different thicknesses of coating layer. The method ofadjusting this roller forms no part of the present in- Vvention and,therefore, need not be described in detail.

' The portion of the periphery of the roller 40 6 which faces thereceptacle 5 forms a part of one wall of this receptacle and isconstantly in contact with the coating material therein. This rollerrotates in the direction `'indicated by the arrow in Fig. 1. Thethickness of the layer of coating material with- .drawn from the supplyreceptacle by the roller depends upon the distance of the periphery ofthe roller from the upturned edge 9 of the receptacle wall. Lumps of the'50 coating material or foreign matter which are present in thereceptacle tend to collect at this point and these act to remove thecoating material from the roller as it leaves the receptacle. Variousdevices have been provided to effect the removal of these obstruct-ions,but these generallyhave been manually operated.l Considerable diflicultyi's encountered ingetting the operator to use such devices and theresults have not beer4 tively removes all obstructions from the vicinityof the periphery of the roller as such roller leaves the supplyreceptacle but constantly agitates the material in thereceptacle anduniformly spreads the same over the roller. This device comprises arevoluble screw or worm-as 10, which eX- tends transversely of thereceptacle" adjacent to the roller 6 and the upturned edge 9 of thereceptacle. In the present embodiment this screw is directly driven fromthe main shaft 11 of the roller (i by means of gears 12 and 13. Thisscrew is preferably of steep pitch and acts to continuously pushthelumps of foreign matter longitudinally of the roller toward the end wallof the receptacle. I prefer to shape'the upturned edge of the receptacleWall to substantially fit about the screw in the manne-1' indicated at14 in Fig. 1.

InA the foregoing description itwill be' evident that my improvedcoating mechanism operates entirely automatically and is not dependentupon the will of the operator. A uniform distribution of the coatingmaterial on the periphery of the feed roller is insured at. all timesand constant agitation of the coating material is provided. Themechanism is simple in 'construction and is applicable to practicallyany form of coating mechanism in which the coating material is withdrawnfrom a supply receptacle by means of a feed roller.

I am aware that the form and arrangement ,of the parts may beconsiderably varied withoutdeparting from the spirit of my invention,and I reserve the right to make all such changes as fairly fall withinthe scope of the lfollowing claims.

I claim as my invention:

1. In a coating device, the combination of a receptacle for coatingmaterial, a revoluble feedI roller for withdrawing the coating material'from said receptacle so positioned relatively to said receptacle that aWall of the latter co-operates wlth the pey riphery of said roller todetermine the thickedge, a revoluble feed roller dipping intoA saidreceptacle and forming a moving Wall of the latter, the periphery ofsaid roller cooperating with said free edge to determine the thicknessof the layer of coating material Withdrawn by said roller, and meansnormally Wholly immersed in the coating ma'- terial operative tocontinuously abst-ract lumps tending to lodge in the pass between saidrollerand said fixed Wall.

3. In a coating device, the combination of a revoluble feed roller, areceptacle for coating material formed with an up-turned end Wallterminating in a free edge parallelv with and narrowly spaced from theperiphery of said roller and co-operating with the latter to determinethe thickness of the layer of coating material Withdrawnfrom saidreceptacle by said roller, and a revoluble member in said receptaclelocated behind vsaid end Wall and closely adjacent to the free edge ofthe latter and the periphery of said roller operating to agitate thematerial in said receptacle adJacent to said roller, to Withdraw lumpstending to clog the 4pass between said end wall and roller, and to eecta uniform distribution of the coatingmaterial on the periphery of saidroller.

4. In a coating device, in combination a receptacle for holding a supplyof coating material,` a revoluble feed roller for Withdrawing saidmaterial therefrom, and a substantially helical member revoluble in saidreceptacle adjacent said roller to agitate the material therein andprovide a uniform distribution of said material on theperiphery of saidroller.

5. In a coating device, in combination a receptacle for holding a supplyof coating material, a revoluble feed roller ope-rating therein toWithdraw said material therefrom, a revoluble screw -member mounted insaid receptacle adjacent said roller with its axis substantiallyparallel with the axis of said roller to cause a movement of saidmaterial longitudinally of said roller and means for actuating saidscrew.

' HERMAN Gr. WEBER.

